Problem 14.7Given: The stress concentration factor for a hole in a beam isapproximately 3.0 if the diameter of the hole is small comparedto the depth of the beam. Two 10.0-mm diameter holes aredrilled through the beam at equal distances from the neutralsurface. Use the moment of inertia for the net section throughthe holes and Scc= 3.0.Find: the magnitude of the bending moment M for the case inwhich the limiting flexural stress is 120 MPa. a) for y'=50.0 mm to the outer edges of the holesb) for y'=75.0 mmSolution:The maximum stress is:σ120 MPa⋅:=Scc3:=σM y⋅IxScc⋅=a) Ix50 mm⋅200 mm⋅()3⋅12250 mm⋅10 mm⋅()3⋅1250 mm⋅10⋅mm⋅45 mm⋅()2⋅+
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